irkes rikes ikres kires rkies kries ireks rieks ierks eirks reiks eriks ikers kiers iekrs eikrs keirs ekirs rkeis kreis rekis erkis keris ekris irkse rikse ikrse kirse rkise krise irske riske isrke sirke rsike srike iksre kisre iskre sikre ksire skire rksie krsie rskie srkie ksrie skrie iresk riesk iersk eirsk reisk erisk irsek risek isrek sirek rsiek sriek iesrk eisrk iserk sierk esirk seirk resik ersik rseik sreik esrik serik ikesr kiesr ieksr eiksr keisr ekisr ikser kiser isker siker ksier skier ieskr eiskr isekr siekr esikr seikr kesir eksir kseir skeir eskir sekir rkesi kresi reksi erksi kersi ekrsi rksei krsei rskei srkei ksrei skrei reski erski rseki sreki esrki serki kesri eksri kseri skeri eskri sekri
Note: these 'words' (valid or invalid) are all the permutations of the word irkes. These words are obtained by scrambling the letters in irkes.